Truck-bolster.



W. E. WOODARD.

TRUCK BOLSTER.

APPLICATION FILED MAR.13, 1914.

Patented June 16, 1914.

INVENTOR w k k WITNESS M/d/M WILLIAM E. woonaan, or scneunc'ranv, New You 7 raucx-nons'rnn;

' Speciflcation 0! Letters ream.

Application filed larch 1a, 1914. Serial m. mars.

To all whom it may concern:

Be it known that I, WILLIAM E. WoonARn, of Schenectady, in the county of Schenectady and State of New York, have-invented acertain new and useful Improvement in Truck-Bolsters, of' which improvement the following is a specification.

My invention relates-to holsters for the trucks of railroad rolling stock, and its object is to provide a swin or lateral motion bolster which shall embo y the same characteristics, as to capacity of lateral motion and the exertion of proper resistance there-' to, as are presented in bolsters supported on swing links in the ordinary manner,'with a reduction in the number of parts and the requirement of no greater space than is 00- cupied by a bolster which is incapable of lateral motion.

The improvement claimed is hereinafter fully set forth.

In the accompanying drawings: Figure 1 is a vertical longitudinal central section through a. truck bolster illustrating an application of my invention; Fig. 2, a plan or top view of the major portion of the same; Fig. 3. a transverse central section; Fig. 4, a partial longitudinal section, on an enlarged scale. on the line a a of Fig. 5. illustrating a structural modification; and, Fig. a transverse section, on the line b b of Fig. 4. a s

It is well recognized in railroad practice that it is decidedly desirable. and. under certain conditions, essential, that car trucks should be of such construction as to permit the center pins of the cars to be laterally deflected. to the end of easing blows on the road bed and rails in passing curves. In entering and leaving curves or striking uneven places in the track, the trucks are suddenly deflected laterally from their normal line of movement. which deflection transmits a blow or sudden pressure to the center pin of the car. with the result that the latter is subjected to a suddenlatoralshock. with a corresponding reaction on the track structure. Trucks provided with bolsters capable of transverse lateral motion under these conditions. do not transmit the shock fully to the car body. as the deflection of the bolster materially lessens the shock. and the reaction upon the track is correspondingly reduced.

The correctness of principle of lateral motion trucks is, and has been for a long Patented June 16, 1914.

time past, fully admitted by constructors.

and operators of railroad rolling stock, in

passenger car design, and it is now enr bodied in the construction of practically all trucks for this class of equipment. At-

tempts have also been made to rovidej; a

somewhat similar lateral motion 1n freight carand other trucks, by the interposition of rollers or shdmg plates between the bolster and the springs, so as to allow a certain amount of lateral motion to" the bolster,"

relatively to the side frames of the truck.

In such case, the characteristics of resist-.

ance to lateral motion are difierentfrom those obtaining with the, swinginglinks ordinarily applied in passenger car trucks, by

reason of the mechanical, limitations of the devices used. a h

My invention is designed to afiord the lateral motion and lateral resistance characteristics of the ordinary swing link bol' stcr, under a construction involving the use of a lessnumber of parts, and with a re duction in the space required for the lateral movements of the bolsterproper.

Referring to the :clrawings, int-he practice of my invention, I provide an outer or main bolster, 1 which, assl-ownin Figs. 3 and 5, is of substantially U or. channel section, and on which, adjacent to its ends, there are.

formed lateral recesses, 1,, adapted. to fit.

the ordinary bolster guides of the side members of a truck frame,.without the capacity of relative lateral motion, other than the ordinary clearance therein. The ends of the main bolster, 1. are supported on. the truck frame through the. intermediation of s rin arran ements of anv suitable known- P t form. which, as they do not form any part of my present invention, are not herein.

shown. An inner or supplemental bolster, '2, of substantially "inverted U or channel section, is located within the main bolster. L'ivith the capacity of longitudinal movement relatively thereto, and. consequently, or transverse movement relatively to the truck frame. The supplemental bolster is supported, adjacent to its ends. upon the main bolster, 1, by rockers, 3, having segmental lower journals, 3. resting in corresponding bearings, 1", extending transversely in the main curved upper faces, 3",

abutting on bearing faces, 2", on the lower side of of lateral bolster, and having the top plate of the supplemental bolster, 2. The

' the Uni-ted States'No. 1,060,222, granted and rockers, 3, permit the longitudinal"movement of the supplemental bolster, relatively to ,the mam bolster, while oppos- 'ing the necessary -resistance thereto, and ;by proper changes of the contour of the bearing surfaces of the rockers, or of the surfaces of the supplemental bolster which rest thereon, this resistance may beQmade an increasing, a constant, or a decreasing quantity, asfully set forth'in Letters Patent of issued to meander date of April 29, 1913.

I consider'it to be most desirable to provide a resistance which shall approximately correspond to that exerted in the case -of a bolster supported on swinging links, as ordinarily applied in passei'iger car trucks.

The supplemental bolster, 2, may be sup- }.)U ;f t6d $0 that in its movements, its upper surface will remain parallel with that of the main bolster, or the surfacesbearing on the rockers may, as shown, be disposed so as to cause the supplemental bolster to tilt or be inclined relatively to the main bolster, in

bolster, and are turned over at their ends thereon, said links passing under, but entirely cleafiof, lateral lugs 3, on the rockers.

' If the supplemental bolster should be accidenta'lly lifted or displaced, the links, 4, will insure its return to proper relation with the rockers. The separation of the main I and supplemental bolsters, in cases of acci-' dent. or derailment, is prevented by a center pin, 5, which passes through a lower center plate, 2, on the supplemental bolster, and through a longitudinal. slot, 1, in the bottom plate of the main bolster, the center pin being held in position by a nut, 5 and Washer, 5 on its lower end. The center pin thereby prevents the withdrawal ofthe supplemental bolster from its position in themain'bolsten while providing for its range of longitudinal and vertical movement relatively thereto.

I claim as my invention and desire to secure by Letters Patent:

1. In a bolster structure for railroad car trucks, the combination of an outer or main bolster, an inner or supplemental bolster, and rockers journaled transversely in the main bolster and supporting the supplemental bolster.

In a bolster structure-for railroad car trucks, 'the combination of an outer or main bolster having lateral recesses adjacent to its ends for engagement with bolster guides and transverse journal bearings, rockers-jonrnaled in said bearings and having curved upper surfaces, and an inner or so pleniental bolster supported on said sur aces.

3. in a bolster structure for railroad car trucks, the combination of an outer or main bolster, an inner or supplemental bolster lorated therein, rockers journaled transversely in the main bolster and supporting the supplemental bolster, and links connected to the supplemental bolster and passing under lugs on the rockers.

i. In a bolster structure for railroad car trucks, the combination of an outer or main 'bolster, an inner or supplemental bolster located therein and having a center plate on its top, rockers journaled transversely in the main bolster and supporting the supplemental bolster, a center pin fittin in the center plate and in a longitudina slot in the main bolster, and means for preventing vertical displacement of the center pin.

5. In a bolster structure for railroadcar trucks, the combination of an open topped outer or main bolster having lateral bolster guide recesses adj accnt to its ends andtransverse journal bearings on its bottom, an inner or supplemental bolster of inverted U section located Within the main bolster and having rocker bearing surfaces on the inner side of its top plate; and rockers journaled in the bearings of the main bolster and having curved 'upper surfaces abutting on the bearing surfaces of the supplemental bolster.

lVILLIAM E. \VOODARD. Witnesses:

Ronen'r RUMIE, Hnnnnn'r W. SNYDER. 

